HSI: omap-ssi: add COMMON_CLK dependency

Enabling the omap ssi driver without COMMON_CLK results in a build failure:

drivers/hsi/controllers/omap_ssi_core.c: In function 'ssi_clk_event':
drivers/hsi/controllers/omap_ssi_core.c:304:7: error: 'PRE_RATE_CHANGE' undeclared (first use in this function)

This adds a Kconfig dependency to avoid the invalid configuration.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 4bcf7414 ("HSI: omap-ssi: add clk change support")
Signed-off-by: Sebastian Reichel <sre@kernel.org>

drivers/hsi/controllers/Kconfig

@@ -5,7 +5,8 @@ comment "HSI controllers"
 
 config OMAP_SSI
 	tristate "OMAP SSI hardware driver"
-	depends on HSI && OF && (ARCH_OMAP3 || (ARM && COMPILE_TEST))
+	depends on HSI && OF && ARM && COMMON_CLK
+	depends on ARCH_OMAP3 || COMPILE_TEST
 	---help---
 	  SSI is a legacy version of HSI. It is usually used to connect
 	  an application engine with a cellular modem.